<h2>Full example</h2>
<pre><code>// Source: https://www.stata.com/manuals/m-1first.pdf page 12
numeric matrix tanh(numeric matrix u)
{
	numeric matrix eu, emu
	eu = exp(u)
	emu = exp(-u)
	return( (eu-emu):/(eu+emu) )
}</code></pre>
